Welcome to a laptop battery specialist of the Acer Laptop Battery
I'll add a quick warning here about machines you'll want to stay away from - the market is still saturated with 2007 era netbook computers. These 7" and 8" screen machines are cute and cuddly, and often available for under $150, but as soon as you try to get any real work done on them, you'll realize why they are priced to ship. The first generation Asus Eee PC had a mere 4GB of storage and an 800x480 display. For comparison, an iPhone has better specifications.
Non Windows powered machines are also a bad idea - the first generation netbooks with battery such as Acer BTP-550P Battery , Acer BTP-73E1 Battery , Acer BATCL50L Battery , Acer TravelMate 290 Battery , Acer TravelMate 4000 Battery , Acer TravelMate 2300 Battery , Acer Aspire 1680 Battery , Acer Aspire 1410 Battery , Acer TravelMate 4500 Battery , Acer LCBTP03003 Battery , Acer Aspire 3820 Battery , Acer Aspire 5820 Battery kept their prices even lower by installing specially designed versions of Linux.